Question

Write the expression as the sine, cosine, or tangent of an angle.

(tan (pi/5) + tan (pi/2))/(1-tan (pi/5) tan (pi/2))

Answer 1

Explanation:

the formula is :

tan (a+b) =

(tan (a) + tan (b)) / ( 1 - tan (a) . tan (b))

therefore

tan (π/5) + tan (π/2)) / (1-tan (π/5) tan (π/2))

= tan (π/5 + π/2)